Channel flow around moving circles

The following examples concern channel flow around two moving circles.

The aim of the following simulations is just to demonstrate the utility
of our "Fictitious Boundary Conditions": All calculations are performed on
ONE SINGLE mesh which does not change! The position of the actual boundary is
determined via "filters" and incorporated into the iterative solvers! A more
detailed description of the underlying mathematical and numerical concepts
is given in
Stefan Turek's CFD-book, Springer

The complexity of the physical problem depends on the:

size of the balls and the channel

inflow speed and speed of the balls

viscosity parameter

A systematic variation of these different configurations is part of the following flow situations.